York S1-025-31835-000 Limit Switch

The York S1-025-31835-000 Limit Switch is an essential safety component specifically engineered for York furnace and air handling systems. This automatic reset limit switch is calibrated with a 140°F opening threshold and a 110°F closing threshold, functioning as a primary thermal safeguard for the heat exchanger. When temperatures exceed the safe operating range, the switch interrupts the burner circuit to prevent equipment damage and potential safety hazards. As a genuine OEM York replacement part, it ensures seamless integration with the factory wiring harness and mounting footprint, eliminating the calibration drift often seen with generic alternatives. Field technicians utilize the S1-025-31835-000 to resolve issues related to short-cycling and blower motor timing. This 140-110 limit switch is designed for high-cycle durability, maintaining precise HVAC safety switch parameters across thousands of thermal cycles. Proper installation of this part is critical for restoring the correct sequence of operation and ensuring long-term system reliability in residential heating applications.

• Automatic Reset Functionality: Automatically restores the circuit once the plenum temperature cools to 110°F, reducing downtime and manual resets.
• OEM Thermal Calibration: Factory-set 140°F trip point provides accurate over-temperature protection matched to specific York heat exchanger tolerances.
• Direct Technical Fit: Engineered for immediate compatibility with York, Luxaire, and Coleman equipment without requiring bracket modifications.

Common Questions

Why is my York furnace tripping the limit switch?

A tripped limit switch usually indicates an airflow restriction. Check for dirty filters, blocked registers, or a failing indoor blower motor that is preventing heat dissipation.

How do I test a York S1-025-31835-000 replacement?

With the power off, check for continuity across the terminals while the switch is below 140°F; it should be normally closed. If it remains open at room temperature, the internal bimetal disc is defective.

Can I bypass this switch during troubleshooting?

Bypassing a safety limit is never recommended. If the system is tripping, identify the source of the overheat to prevent cracking the heat exchanger or compromising safety.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.